Process of purifying sugar-juice.



UNITED STATES Patented January 3, 1905.

PATENT OFFICE.

HENRIETTE BREYER, OE KOGEL, NEAR NEU LENGBACH, AUSTRIA-HUN- GARY. ASSIG-NOR OE FOUR-FIFTHS TO ALFRED JURNITSOHEK VON \VEHRSTEDT, OF CASTLE IPUCHBERG, NEAR ELS, AUSTRIA-HUNGARY.

PROCESS OF PURIFYING SUGAR-JUICE.

SPECIFICATION forming part of Letters Patent No. 779,261, dated January 3, 1905.

Application filed August 25, 1904. Serial No. 222,142.

To (1,7 7 whmn, zit 722111 11 concern:

Be it known that I, H ENRTE'ITE BREYER, a subject of the Emperor of Anstria-Hungary, residing at .Kogel, near Neu Lengbach, Lower Austria, Austria-Hungary, haveinvented certain new and useful Improvements in Processes of Purifying Raw Sugar-Juices or Diffusion- Juices, of which the following is a specification.

This im'ention relates to a process for purifying raw sugar-juices or diffusion-juices, said process having for purpose to reduce the quantity of the required lime, to accelerate considerabl y the saturation, to increase the purity of the juices, to diminish the required quantity of carbonic acid, and to facilitate the liltering operation. For attaining this purpose the raw juice or diffusion-juice heated to a temperature of about 0flcentigrade is intimately mixed in the mixing-receptacle (malaxator) with a pulverulent purifying agent, whereupon it is saturated by forcing into the mixture carbonic acid in the direction from the bottom to the top. Through this blowing in of carbonic acid the pulverulent purifying agent which is added to the juice is maintained in a constant motion during the whole operation of saturation. The said purifying agent is composed of an intimate mixture of hydroxid of calcium in powder with brickdust, the latter being prepared by reducing well-calcined bricks to powder. The proportion of the ingredients of this mixture is two parts of hydroxid of calcium to one part of brick-dust To the heated raw or diffusion juice in the malaxator the said mixtureis added inaquantity which is determined by analysis. A number of experiences has proved that in the majority of cases an addition of the pulverulent purifying agent in the same quantity in which until now lime has been added and which in all cases exceeds one per cent, by weight, of the beet-root will be sufiicient to obtain by the said treatment clear juices, which are to a far greater extent exempt from impurities than the juices which have been treated after the purifying methods known hitherto. The said improved method, moreover,permits a precipitation of the impurities in a shape by far more favorable for the subsequent mechanical separation of these impurities from the filtered juice than when working according to the known methods that is to say, the impurities are precipitated in denser masses and in the form of larger flocks. The saturation takes place very rapidly and without the formation of scum. The alkalinity is maintained at 0.06. After this first saturation a clear juice is obtained, which flows rapidly through the filter-presses, and the edulcorationof the sediment is effected in a more rational manner than with the ordinary working methods. The filtered juice is then heated to 90 centigrade and without the addition of lime is submitted to a second saturation until its alkalinity is reduced to from 0.01 to 0.009. The proportion of lime is then so small that the presence of the lime cannot be detected by ammonium oxalate. The juice produced in the above-described manner is then submitted to further treatment according to the ordinary methods.

I am fully aware that the employment of brick-dust has already been proposed for the purpose of purifying raw sugar-juices. (See the work of E. F. Maumen: Tmzfe' T /L@0- w quc at Pra/tque de la Sucroric.) The proc ess described in this treatise proposes to effect the purification of the juices with a very small amount of lime (three to six thousandths) and in maintaining low"temperatures not exceeding and it consists, essentially, in that briclcdust is added to the precipitates formed after the decantation of the juice, which is said to be clear. The addition of the brick-dust 5 has for its only purpose to bring about an easier filtration. Now this process has proved to be absolutely impracticable,because a puritieation of the juice cannot be obtained when employing such small quantities of lime as 9 are proposed by Maumen and the addition of brick-dust, if it is really performed in the manner indicated in the treatise, cannot contribute to the purification and decoloration of the juices. Only when an intimate mixture of hydroxid of calcium with brick-dust is added to the juices, as has been described in the preceding specification, and maintained in a permanent eddying motion by the carbonic acid introduced for the purpose of saturation, can a sufiicient degree of purification of the juices answering to all requirements, and at the same time a saving of lime and carbonic acid, be attained.

I claim- 1. The process of purifying raw sugarjuices which consists in adding to the juices in a suitable receptacle a pulveruleut puritying agent consisting of a mixture of hydroxid of calcium and brick-dust, and then forcing carbonic acid into and through the mixture.

2. The process for purifying" raw sugar juices which consists in heating the juices to about 80 centigrade, mixing therewith a pulverulent purifying agent consisting of two parts of hydroxid of calcium and one part of brick-d ust in quantity exceeding one per cent. by weight of the beet-root, and then maintain-- ing constant agitation of the mixture by blowmg carbonic acid into and through the same.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses.

HEN RIET'IE BREYER.

IVitnesses:

JosEF RUBAROH, ALVESTO S. HoeUE, 

